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MOLDING MAGHINE. No. 478,377. Patented July 5, 1892.

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NITED STATES PATENT OFFICE.

SAMUEL SMITH, OF BURY, ENGLAND, ASSIGNOR TO JOHN BROAD JACKSON ANDGEORGE BENTLEY, OF SAME PLACE.

MOLDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 478,377, dated July 5,1892. Application filed September 22, 1891. Serial No. 406,457. (Nomodel.) Patented in England September 4, 1890, No. 13,909-

.lo all whom it may concern:

Be it known that I, SAMUEL SMITH, foreman pattern-maker, a subject ofthe Queen of Great Britain and Ireland, residing at No. Parker Street,Bury, in the county of Lancaster, England, have invented certainImprovements in Machines or Apparatus for Describing Figures, applicablemore especially for use in making molds for foundry pur poses, (forwhich I have obtained a patent in Great Britain in conjunction with JohnBroad Jackson and George Bentley, No. 13,909, dated September 4, 1890,)of which the following is a specification.

This invention has forits object to provide a machine or device by meansof which various figures can be described, and it is more especiallyintended for use for making molds for foundry purposes, although its useis not limited to that particular purpose.

I will describe the apparatus with reference to the accompanyingdrawings as adapted for use in describing at one operation the figure ofa mold for the two parts Qf a pulley, from which description its generalconstruction for other purposes will likewise be understood.

Figure 1 shows in vertical section, and Fig. 2 in plan, an apparatusconstructed according to my invention. Fig. 3 shows the guid ing or camgroove or matrix; and Fig. 4 is a perspective sectional view of a formof the apparatus in operation upon a mold, showing how the standard maybe protruded through the mold. Fig. 5 is a view similar to Fig. 3,showing another form of groove. Fig. 6 is a horizontal sectional View ofthe apparatus. Fig. 7 is a perspective view of the finished mold withthe core in position.

Pulleys or analogous castings require to be made in halves or separateparts, and the apparatus constructed according to this invention isadapted to describe two semicircles making up the complete circle of thepulley, the said two semicircles being separated by a space for beingfilled in bya core to separate the two parts of the mold, so that themetal can be poured into both parts at the same time, and then on thecore beingremoved the two parts so cast are joined together to make thecomplete pulley. These two parts and the space for the core aredescribed by one revolution of the apparatus without moving it from itsposition. I

In an apparatus constructed according to this invention upon a suitablebase or support A is secured a spindle B, and upon this spindle ismounted a disk 0, having therein a cam-groove c of the shape of the twosemicircles, joined by a part which corresponds to the space for thecore between them, as shown in the separate view, Fig. 3. The arm D,which carries the tool bywhich the mold is formed, (or the tool by whichany desired figure is to be described) has its inner end forked, as atd, or provided with a slot or hollow'boss, which embraces the spindle Bor a collar on it, as at E, and the said arm is provided with aprojection preferably consisting of a pinf, with a roller f upon it,which enters the cam-groove c and when the arm D is rotated it followsthe cam-groove c and the tool consequently describes the figure of thecam-groove and forms the required mold' or makes the required figure.The disk 0 is preferably secured to the spindle B by means of a collar gand fixing-screw g engaging in a longitudinal groove bin the spindle, sothat the disk 0 and its adjuncts can be raised or lowered and secured onthe spindle in the same positions relatively to the circumference of thespindle, although varying in height. The inner end of the arm may beflanged, as at 61 and the cam-groove and parts adjacent thereto can beboxed in to protect them, and this can be done by means of a fixedcover-piece h and an encircling piece 1', the latter being capable ofrevolving in the grooves j with the arm D and having an open ing throughwhich the said arm projects. A pin may pass through the arm, as shown atk, and serve to indicate the terminations of the half-circles, andconsequently the position for the core, by engaging indiametrically-opposite holes 6 in the disk 0.

It will be understood. that by substituting disks with different-shapedcam-grooves in them figures other than that mentioned can be described.Fig. 5, for instance, is a plan of a disk with a cam-groove adapted forforming molds in four parts.

Fig. 7 shows a finished mold, S S being the outside mold and T T thecore.

Having now particularly described and ascertained the nature of thisinvention and in what manner the same is to be performed, I declare thatwhat I claim is- 1. In an apparatus for making molds, &c., thecombination of a base carrying a spindle and provided with a disk havinga cam-groove, a tool-carrying arm adapted to rotate about the spindle,and a projection from the arm, adapted to work in the cam-groove,substanlially as set forth.

2. In an apparatus for making molds, duo,

SAMUEL SMITH. \Vitnesses:

GEORGE 1LT. OHARLEsWoRrI-I, Notary Public, ilfancheszfer.

FRED II. VETTER, 56 Brown 86., Jll'rmcheser, Notary/s Clerk.

